package com.heima.media.interceptor;

import com.heima.common.dto.User;
import com.heima.common.util.MediaThreadLocalUtil;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserInterceptor implements HandlerInterceptor {

    //前置拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求中的请求头
        String userId = request.getHeader("userId");
        //请求头不为空，将userId存放到到本地线程中
        if (!StringUtils.isEmpty(userId)) {
            User user=new User();
            user.setUserId(Integer.parseInt(userId));
            MediaThreadLocalUtil.set(user);
        }
        return true;
    }
    //后置拦截
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        MediaThreadLocalUtil.remove();
    }
    //渲染后
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
